Improved burglar-proof plates for doors, safe-walls



NITED STATES PATENT Ormea.

LINUS YALE, JR., OF NEWPORT, FEW- YORK.

vAu LTS, atc.

Specification-forming part of Letters Patent No. 9,350, dated October19, 1852.

To all whom t may concern Be it known that I, LINUS YALE, Jr., ofNewport, in the county of Herkimer and State of New York, have inventeda new and Improved Method of Making Burglar-Proof Ilates, Doors,and'Ohests of (last and Malleable Iron 5 and I do hereby declare thefollowing to be a full and exact description of the same.

The method I have invented obviates the difliculties heretoforeexperienced in the use of cast-iron or any of the old combinations ofcast and malleable iron for the above-named purposes-wiz., first, thebrittleness of castiron; secondly, the usually-exposed position of themalleable iron to the drill and chisel of the burglar, these objections,one or both,

existing` against all previously-invented defenses of this kind made ofthese materials.

To enable others skilled in the art to use my invention, I will proceedto describe its construction, reference being had to the annexeddrawings, forming part of this specilication.

Upon the edges of the pattern for the intended plate or door I put coreprints, which when the mold is made, form a resting-place for themalleable iron. This pattern is molded in the usual manner, and beforethe flask is closed I place transversely rods of malleable iron in thecore prints before mentioned, which are thus supported about midway ofthe mold, and around which the melted iron runs and incloses them whenpoured in the usual manner. These rods I usually interweave, as seen inFig. 1, and also in section, Fig. 2; or they may be simply crossed, asin Fig. 3,orsection,Fig. 4; orthey may be looped together, as in Fig. 5,or bent without crossing, as in Fig 6, in either of which ways theyanswer the purpose intended-viz., to protect the plate or door frombeing separated when fractured.

I do not use straight rods without crossing, becausethe plate or door,Ste., might be fractured through :its whole extent without the line offracture crossing a rod, and this it would be liable to, inasmuch as theline of fracture commonly follows the line of the rods. Thus the door orplate, 85e., being completely broken into two separate parts that arenot tied by bent or crossed rods or their equivalents, is renderedworthless.

These particular methods of combining malleable and cast iron,necessitating as they do the use of crossed or bent rods or theirequivalents, are essential in the new and improved process ofmanufacturing burglar-proofplates, doors, Sac., that I have invented.

The process thus far detailed produces a platev or door which is asufficient protection against blows or pressure.

Combined with the above process, as a security against the drill andchisel of the burglar, I arrange in the mold a chill plate or plates insuch manner as to harden 011e or both sides of the required plate ordoor. This et'- fectually prevents drilling a series of holes or cuttinga circular or other groove, thereby enabling the operator to remove aportion of said plate or door, &c.

The proportion between the thickness of the plate and the spaces betweenthe malleable rods should be such that the plate would not by ordinarymeans be broken into pieces of less diameter than the meshes orspacesbctween the rods. It will be seen that should the plate be broken ,thussmall and the fracture follow the line of the rods, the pieces could notbe withdrawn, owing to the fact that the half of the diameter of therods would be einbedded in the edges of each piece, the shape of saidpieces being such asl seen in Fig. 7; neither could the rods be shearedoft` at the line of fracture, as there would be no stability of one partfor another to shear against.

I do not claim in said plates, doors, and chests the castin gin ofstraight rods or bars of malleable iron, or their equivalents, embeddedparallel with each other vin only one general direction.

What Ielairn as new and of. my invention,

and desire to secure by Letters Patent, is-

A method of 'making burglar proof plates, doors, and chests of iron,which, in the process of being cast into the form. required for suchplates, doors, and chests, surrounds or embeds malleable-iron rods orbars, or their equivalents, arranged substantially as described andshown by the specification and drawings herewith accompanied, or in anequivalen t manner.

LINUS YALE, Jn. Witnesses:

STUART PERRY, WM. H. WILLARD.

